The
function write accepts keyword arguments named
:pprint-dispatch, :miser-width, :right-margin, and :lines,
corresponding to these variables.

[Variable]*print-pprint-dispatch*

When *print-pretty* is not nil, printing is controlled by the `pprint
dispatch table' stored in the variable *print-pprint-dispatch*. The
initial value of *print-pprint-dispatch* is implementation-dependent and
causes traditional pretty printing of Lisp code. The last section of this
chapter explains how the contents of this table can be changed.

[Variable]*print-right-margin*

A primary goal of pretty printing is to keep the output between a pair of
margins. The left margin is set at the column where the output begins. If
this cannot be determined, the left margin is set to zero.

When *print-right-margin* is not nil, it specifies the right
margin to use when making layout decisions. When *print-right-margin*
is nil (the initial value), the right margin is set at the maximum
line length that can be displayed by the output stream without wraparound
or truncation. If this cannot be determined, the right margin is set to an
implementation-dependent value.

To allow for the possibility of variable-width fonts,
*print-right-margin* is in units of ems-the width of an
``m'' in the font being used to display characters on the relevant output
stream at the moment when the variables are consulted.

[Variable]*print-miser-width*

If *print-miser-width* is not nil, the pretty printer switches to a compact
style of output (called miser style) whenever the width available for
printing a substructure is less than or equal to *print-miser-width* ems.
The initial value of *print-miser-width* is implementation-dependent.

[Variable]*print-lines*

When given a value other than its initial value of nil,
*print-lines* limits the number of output lines produced when
something is pretty printed. If an attempt is made to go beyond
*print-lines* lines, `` ..'' (a space and two periods)
is printed at the end of the last
line followed by all of the suffixes (closing delimiters) that are pending
to be printed.

(The symbol ``..'' is printed out to ensure that a reader error will
occur if the output is later read. A symbol different from ``...'' is
used to indicate that a different kind of abbreviation has occurred.)